Siphalor/tweed5-commons-logging
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Add support for Log4j API and SLF4J (#177)

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The logging backends supported by the default `LogFactoryImpl` have all
reached their end-of-life (except JUL and `SimpleLog`). Third-generation
logging backends, such as Log4j Core, support multiple logger contexts
per application and therefore can not be handled by the simplified
caching mechanism in `LogFactoryImpl`.

This PR introduces two new `LogFactory` implementations,
`Log4j2LogFactory` and `Slf4jLogFactory`, that forward messages to the
Log4j API and SLF4J.

During initialization the three existing factories are checked in the
following order:
 1. the `Log4j2LogFactory` has highest priority, since the Log4j API can
    faithfully transmit messages of type `Object`,
 2. the `Slf4jLogFactory` is the next choice. However, if the
    Log4j-to-SLF4J bridge is present we log directly through SLF4J
    instead of the Log4j API.
 3. the legacy `LogFactoryImpl` has lowest priority.
This commit is contained in:
Piotr P. Karwasz
2023-11-03 16:19:14 +01:00
committed by GitHub
parent b7f50da2aa
commit 946711e0a6
9 changed files with 1016 additions and 6 deletions
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26
src/test/resources/log4j2-test.xml Normal file
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<!--
~ Licensed to the Apache Software Foundation (ASF) under one or more
~ contributor license agreements. See the NOTICE file distributed with
~ this work for additional information regarding copyright ownership.
~ The ASF licenses this file to You under the Apache License, Version 2.0
~ (the "License"); you may not use this file except in compliance with
~ the License. You may obtain a copy of the License at
~
~ http://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
-->
<Configuration>
<Appenders>
<List name="LIST"/>
</Appenders>
<Loggers>
<Root level="TRACE">
<AppenderRef ref="LIST"/>
</Root>
</Loggers>
</Configuration>

22
src/test/resources/logback-test.xml Normal file
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<!--
~ Licensed to the Apache Software Foundation (ASF) under one or more
~ contributor license agreements. See the NOTICE file distributed with
~ this work for additional information regarding copyright ownership.
~ The ASF licenses this file to You under the Apache License, Version 2.0
~ (the "License"); you may not use this file except in compliance with
~ the License. You may obtain a copy of the License at
~
~ http://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
-->
<configuration>
<appender name="LIST" class="ch.qos.logback.core.read.ListAppender"/>
<root level="TRACE">
<appender-ref ref="LIST" />
</root>
</configuration>